Machine for manufacturing concrete pipe.



L. J. SANKER.

MACHINE FOR MANUFACTURING CONCRETE PIPE.

APPLICATION FILED MAR. 30. 1914.

1,166,788. v Patented Jan, 4, 1916.-

2 SHEETS-SHEEI I.

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L. J. SANKER.

MACHINE FOR MANUFAQTURING CONCRETE PIPE.

APPLICATION FILED MAR. 30. 1914.

1,166,788. Patented Jan. 4, 1916.

I 2 SHEETS'SHEET 2.

W 7% W 57 ZwHara Jkfin Joli/(er UNITED STATES PATENT OFFICE.

LEONARD r. SANKER, or Losanenfns, catironma.

MACHINE r012. manuracrnmue concnnrn PIPE.

I To all whom it may concern:

Be it known that I, LEONARD J. SANKER,

a citizen of the United States, residing at Los Angeles, in the county of LosAngeles, State of California, have invented new and useful Improvements in Machines for Manufacturing Concrete Pipe, of which the fol-' lowing is a specification.

This invention relates to a machine for manufacturing concrete pipe.

It is the object of this invention to provide a concrete pipe making machine by which the concrete materials of which the pipe is formed may be imoldedand packed and removed from the machine with great rapidity. I v

A further object is to provide a concrete pipe forming machine in which centrifugal force is employed in packing the plasticmixture and removing superfluous moisture therefrom. i A further ob ect 1s to provlde means for facilitating the removal of the formed pipe from the machine without danger of injuring the same; r I

A further object is to provide means for troweling the interior surface of the pipe in the course of its manufacture.

A further object is to provide a pipe mold ing machine for forming pipes of concrete by means of which the heavier aggregates of the concrete will be arranged adjacentthe outer periphery of the pipe and the finer aggregates positionedo-n the inner periphery of the pipe so as to form a smooth impervious surface on the interiorof the pipe. Other objects will appearhereinafter. The invention primarily resides in a di-- vidable mold member formed with a perforated annular wall, a separable annularperforated mold casing adapted to be removably mounted inthe mold member, an expansible-core adapted to be inserted in the space encompassed by the mold member and casing, and means for rotating the mold, whereby the materials in the mold will be packed to form a pipe.

The invention is illustrated in the accom panying drawings, in which:

Figure 1 is a view of the machine in side elevation, with parts broken away. Fig.2 is a detail in side elevation of the upper portion of the machine as seen in the direction indicated by the. arrow -a. in Fig. 1. Fig. 3 is a horizontal section on the line 3-3 of Fig. 1. Fig. 4 is a detail perspective Specification of Letters Patent.

Patented Jan. 4', 1916-.

Application filed March 30, 1914. Serial No. 828,120.

with portions broken away of the concrete pipe produced by this machine. Fig. 5 is a detail in perspective of the separable cylindricalmold casing or lining. Fig. 6 is a detail in section illustrating the manner of connecting the ends of the mold casing together to form it into a cylinder. Fig. 7 is tion, but is here shown as including a vertical revoluble shaft *14 fitted at its upper end with a fly-wheel 15 having a clutch engaging face on its upper face normally out of engagement with a clutch member 16 on mechanism may be of any suitable construca stud shaft 17 arranged in aliuement with the shaft 14 and extending'through a hearing 18 with its upper end terminating ad-- jacent the surface of the floor 13.

The clutch member 16 is'adapted to be' thrown in and out ofjengagement with the fly-wheel 15 by means of'a lever 19 pivoted at 20 and fitted with a foot treadle 21 by which it may be actuated by the operator when it is desired to throw the clutch memher 16 into frictional engagement with the;

fly-wheel 15. p f The spring 22 hearing between the floor 13 and the foot treadle 21 normally maintains the, clutch member 16 out of engagement with the fiy-wheel 15. The shaft 14 is fitted with a beveled gear 23 meshing with a gear 24 on a horizontal shaft '25 provided with a clutch 26 adapted to be'engaged with a belt wheel 27 which may be rotated from an suitable source of ower to rotate the sha 14 at high speed w en the clutch member '26 I is in engagement with the belt wheel 27.

The up er end of the stud shaft 17 is p formed with a flange 28 adjacent the bearing 18 and is formed with a central threaded portion 29 to receive a circular mold base 110.

block 30; the block 30 thus being adapted to be detached'from the shaft 17 whenit is do sired to replace the same by blocks of differ I cut sizes according to the diameters'of the pipe to be molded. j

Rigidly mounted on the block 30 andiextending around the rear half ofits periphery is an upwardl extending semi-circular mold member 32 0 a length approximating that of the length of the pipe section tobe molded. A corresponding semi-cylindrlcal mold member 34 forming the front half of the 10 are formed with aperturesor perforations 37 at suitable intervals throughout.

, Theband is pivoted to the blOCK 30by means of a pivot pin 38 so that the forward portion 34 of the mold may be swung out wardly from the rearward portion. The bottom of the mold comprises a disk 39 adapted toseat on the upper face of' the block 30 having an upwardly and outwardly inclined flanged portion'40 terminating in a horizontally extending flange 41, the outer periphery of which conforms to the inner peripheries of the mold members 32 a'nd34.

This bottom member 39 is connected tothe forward mold member 34 by means of rivets" or bolts 36 sothat when the mold member 34 is rocked thebottom portion 39'will move therewith. The mold members 32 and 34 are 5 adapted to encompass a mold casing 42 particularly'shown in Fig. 5, which is formed of sheet metal bent to the shape of a cylinder,

with its ends normally separated but adapted to be connected togetherby means of lugs 43 on the outer face of one end of the sheet which are arranged to engage perforations '44on the overlapping opposite end of the sheet-to form a complete cylinder.

- 42 are beaded to reinforce thecasin The upper and ower edges of the casing and serve, to normally retain the latter in its cylindrical formation. This casing 42 is .formedfwith perforations 45 of smaller di- 7 ameterthan the perforations 39 in the mold' in the concrete in the. molding operation, as latendescribed.

.casingand are providedfor the purpose of permittingthe' escape "of superfluous water Extending axially of the mold membe'rs '32 and 34 is-an expansible core member 46 which is adapted to be reciprocated vertically and moved 1n and out of the space en- 'compassed by the mold members 32 and34 longitudinally of the latter, as occasion requires. This core member comprises an endunderside adapted to be engaged by a tapered centering lug 49 projecting centrally from the upper face of the bottom plate 39.

Rigidly connecting with the plate 47 on diametrically opposite sides thereof are quadrant plates 50 and 51 which extend upwardly and connected with a cylinder 52 of which the quadrants 50 and 51 are a continuation. This cylinder 52 is formed with an annular groove or channel 53 adjacent its upper end which is encompassed by a split sleeve 54 carried on a bracket 55 mounted on a cross bar 56arranged rearwardly of the mold member 32 and slidable vertically on guide members 57 formed on the frame 10.

The frame 56 is formed with side Ilanges 58 which slidably abut against the inner faces of the guide members 57, the outer .ends of which flanges are turned outwardly at 59 to project in front of the guide mempinions 61 and 62 onstud shafts .63 and 64 mounted on the projections 59* 'of the frame.

The pinion 61 is rigid on the stud shaft 64 which shaft is fitted 'iliith a crank'65 by means of which it can "be rotated'to cause the pinion 61 totravel on a vertical rack 66 .on one of the guide members 57, thereby raising or lowering theframe 56; the pinion 62 traveling in or 011. k. 7 on the other gulde member 57.

Hingedly connected to the quadrant plates 5( and 51 of the core'member 46 by means of hlnges 68' are quadrant plates 69 and 7 0,

whichywhenin their normal innermost position, form a continuous cylindrical core wall. These hinged quadrant plates 69 and 70 are designed to be swung outwardly to crowd concrete materials interposed between the core member and the mold members outwardly against the casing '42 when the mold is revolved and at the same timetrowel the inner surface of the molded pipe. This swinging of the-members 69 and 70 is accomplished by means of a verticalshaft 71 havmg lugs 72 onits diametrically opposite sides connected with linKs' 73 which are pivoted at their outer ends by pivot'pins 74 to the outer edges of the hinged quadrant plates 69 'and 70. e

The shaft 71 projects above the upper end of the cylinder 52 and is fitted with a hand lever 7 5 by which it may be'turned to fit the .openin and closin of the bin ed uadrant plate 47 formed with a depression 48 on its g g g q plates 69 and 70. The lower-end of the shaft 71 seats in a bearing formed in the end plate 47 of the core and its upper end:

ing .through vertical slots 78 formedin the cylinder 52 are pins 79, the outer ends of which. engage a sleeve 80 slidably mounted on the exterior of the cylinder 52 and formed with an outwardly extending flange 81 on its lower edge, which terminates in an up wardly divergent flange82 having an annular rim 83 on its outer edge conforming to the inner periphery of the mold members 32 and 34. The sleeve 80 with its flanges forms the top of the mold and is designed to be moved out and in engagement therewith by operation of the hand lever 77.

In the operation of the invention the easing mold member 42 is positioned upon the mold member 34 withits lower end abutting against the bottom plate when the mold member 34 is inits open position as indicated in dotted lines in Fig. 7, whereupon the mold member 34 is rocked on itshinged pivot 38 into its closed relation with the mold member 32 in which position it is secured by means of a loose ring 84 whichis slipped over the upper ends of the mold members 32 and 34 and engaged therewith 55. by means ofopen-ended slots 85 formed on the lower edge of the ring 84, which slots are curved and are adapted to engage studs 7 86 on the mold members 32 and 34. This ring 84 serves to prevent the mold members 32 and 34 from separating during the molding operation.

The core 46 is then lowered into the space endompassed by the mold members by operation of the-crank 65 until the lower end of 5fthe'core is seated upon the bottom plate 40 lug serves both to center the core and also hold it against lateral movement.

of the mold and engaged by the lug 49, which The top of the mold comprising the sleeve and its connected parts is then disposed in its uppermost position, as shown in dotted lines in Fig. 7, by operating the hand lever 77, whereupon the concrete or other plastic mixture, of whichthe pipe 87, as shown in Fig. 4, is formed, is-introduced into the upper end of the mold in such quantity as to fill the latter, whereuponthe top of the mold is lowered into contact therewith. When this has been effected the foot tre'adle 21 is operated to throw the clutch member 16 into engagement with the fly-wheel 15, which is being continuously rotated through the medium of the shafts 14, 25, and the belt wheel 27; the clutch member 26 being previously engaged withthe latter. On the engagement of the clutch member 16 with the fly-wheel 15 a rapid rotation of the stud shaft 17 and the mold member connected thereon is effected. This rotation is of high speed, being preferably "about two thousand revolutions wardly to points adjacent the inner wall of the mold casing 45. I The top part of the mold in forced downward during this voperation so'as to compress-the concretein the mold and at the same time form a channel 88 in the upper end of the molded body of concrete adapted to receivea projection 89 on the lower end of said body by the bottom plate of themold. To render the concrete more compact. and at the same time trowel the inner surface of' the molded pipe the shaft 71: is rocked by means of the'hand hold 75 so as to swing the segment plates 69 andf70, outwardly against the body of concrete in" the mold, thereby effectively troweling the latter and causing a glazed surface to be formed on the interior of the pipe by reason of the rapid speed i of its rotation and because the finer materialsof which the concrete is composed will be disposed adjacent the core. When the foregoing operation has been completed, which in practice requires about two minutes time, the quadrant members-69 and 70'of the core are reciprocated, thus leaving the core clear of the inner walls of the molded pipe, whereupon the core is lifted clear of the molds and the ring '86 removed. The outer mold 34'"is then rocked outwardly on its hinges 38 in the position shown in Fig. 7, whereupon the casing 42 containing the molded pipecan be readily removed and disposed in a convenient place to thoroughly dry. The concrete by being subjected to the centrifugal force is rendered'very compact so that the molded pipein the casing 45 can be readily handled without danger of injury.

Whenthe concrete has been sufliciently set the casing 42 is removed therefrom by prying the overlapping edge thereof out of en 'gagement'with the projections 43.

By the use of this invention concrete pipes of greatdensity and strength can be formed in a short space of time.

What I claim is:

'1. A centrifugal molding machine for ''pivotally connected thereto, a mold bottom 'ing said walls to expand the core.

rigidly attached to the hinged portion of the cylindrical mold body, a reciprocal and non-rotatable core adapted to be positioned in the mold body, a mold top slidably mounted on the core, means for reciprocating said mold'topindependent of the core, and means for locking the mold members to gether.

2. In a centrifugal machine for forming tubular bodies of plastic material, a revoluble base, a pivoted cylindrical mold member formed with apertured walls, one portion of which is rigidly afiixed to the base and the other portion hingedly connected thereto, a mold bottom secured to the hinged portion of the mold body for shaping the end of the tubular body, atubular core adapted to be inserted in the mold member, means for slidably engaging the lower end of said core withthe mold bottom, a mold top slidably mounted on the core for -forming the opposite end of the mold body,- means for reciprocating the mold top independent of the core, hinged walls on said core, and manually operated means for rock- 3. In a centrifugal machine for forming. tubular bodies of plastic material, a revoluble base, a pivoted cylindrical mold meme ber formed with apertured walls, one portion of which is rigidly aflixed to the base and the other portion hingedly connected 1 thereto, a mold bottom secured to the hinged portion of the mold bodyfor shaping the end of thetubular body, a tubular core adapted to be inserted in the mold member,

' the core, hinged walls on said core, manually operated means for rocking said walls to expand the core, comprising a rock shaft extending longitudinally of the core, and

link connections between said rock shaft and. the hinged Walls of the core.

4. A machine for formin tubular 'bodies of plastic material, comprising a revoluble base, a pivoted cylindrical body' member formed of apertured walls having one portion rigidly affixed to said base and the other portion hingedly connected thereto, a mold bottom attached to the hinged portion of the mold body, a perforated casing adapted to be encompassed by the mold body, a reciprocal non-rotatable core, hinged walls on said core, a shaft extending into the core, linked connections between the shaft and the hinged portions thereof by which the latter may be rocked to expand the core by actuating the shaft, and a closure for the upper end of the mold body slidably mounted on the core.

In witnessthat I claim the foregoing l have hereunto subscribed my name this 16th day of March, 1914.

LEONARD J. 'sAiiKEn.

l/Vitnesses 5 EDMUND A. STRAUSE, MARGUERITE' BATES. 

